how to validate dropdownlist in asp.net with c#

Question

0.00/5 (No votes)

See more:

Run mode screen as follows;

i have one list box and one drop down list.

in list box all the student name will display from the database

in the drop down list year will display.

in the run mode user select the student name from the listbox.

if the use did not select the dropdown list, that time shows the message select the Year.

for that how can i validate the dropdownlist using C#

please help me.

Regards,
Narasiman P.

Posted 7-May-13 19:25pm

Member 8054539

Add a Solution

Comments

Jameel VM 8-May-13 1:38am

can you post the markup?

Jameel VM 8-May-13 1:39am

When you want to validate?while listbox selecting event?

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

SagarRS · Answer 1 · 2013-05-07T19:38:00

While binding dropdownlist add the line below

C#

dropdownlist1.Items.Insert(0, "Select");

And for validation you can write below code in button click

C#

if (dropdownlist1.SelectedItem.Text.Trim() == "Select")
        {
            lblmsg.Text = "Please Select Year";
            dropdownlist1.Focus();
            return;
        }

Naz_Firdouse · Answer 2 · 2013-05-07T19:42:00

User should select from dropdownlist means you may be displaying the first item in dropdownlist as "Select"... and you will have a "Search" or "Show" button in your page.

In that case, you can have a bool variable and change its value inside Dropdownlist selection changed event... So whenever user clicks the "Search" button check the bool value and display an alert based on your requirement

how to validate dropdownlist in asp.net with c#

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0